National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
Current conditions at

San Marcos, San Marcos Municipal Airport (KHYI)

Lat: 29.89°NLon: 97.86°WElev: 597ft.

Mostly Cloudy

82°F

28°C

Humidity 34%
Wind Speed S 14 G 20 mph
Barometer 30.03 in (1016.5 mb)
Dewpoint 51°F (11°C)
Visibility 10.00 mi
Heat Index81°F (27°C)
Last update 8 Apr 3:56 pm CDT
Extended Forecast for

4 Miles SW San Marcos TX

  • Tonight

    Tonight: Increasing clouds, with a low around 60. South southeast wind around 5 mph.

    Low: 60 °F

    Increasing
    Clouds

  • Thursday

    Thursday: A 30 percent chance of showers and thunderstorms, mainly after 4pm. Cloudy, then gradually becoming mostly sunny, with a high near 83. Light east wind becoming east southeast 5 to 10 mph in the morning.

    High: 83 °F

    Mostly Cloudy
    then Chance
    T-storms

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms before 1am, then a slight chance of showers. Increasing clouds, with a low around 64. Southeast wind 5 to 10 mph. Chance of precipitation is 30%.

    Low: 64 °F

    Chance
    T-storms then
    Chance
    Showers

  • Friday

    Friday: A chance of showers before 10am, then a chance of showers and thunderstorms between 10am and 1pm, then showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 81. Southeast wind 5 to 10 mph. Chance of precipitation is 60%.

    High: 81 °F

    Chance
    Showers then
    Showers
    Likely

  • Friday Night

    Friday Night: A slight chance of showers and thunderstorms before 10pm, then a slight chance of showers between 10pm and 1am. Mostly cloudy, with a low around 66. Southeast wind 5 to 10 mph. Chance of precipitation is 20%.

    Low: 66 °F

    Slight Chance
    T-storms then
    Slight Chance
    Showers

  • Saturday

    Saturday: A slight chance of showers, then a chance of showers and thunderstorms after 10am. Mostly cloudy, with a high near 82. Southeast wind 5 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 50%.

    High: 82 °F

    Slight Chance
    T-storms then
    Chance
    T-storms

  • Saturday Night

    Saturday Night: A 30 percent chance of showers and thunderstorms. Cloudy, with a low around 67. South southeast wind 10 to 15 mph, with gusts as high as 25 mph.

    Low: 67 °F

    Chance
    Showers

  • Sunday

    Sunday: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Cloudy, with a high near 80. South wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 60%.

    High: 80 °F

    Chance
    Showers then
    Showers
    Likely

  • Sunday Night

    Sunday Night: A 20 percent chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 68. South southeast wind 10 to 15 mph, with gusts as high as 25 mph.

    Low: 68 °F

    Slight Chance
    T-storms

Detailed Forecast

Tonight
Increasing clouds, with a low around 60. South southeast wind around 5 mph.
Thursday
A 30 percent chance of showers and thunderstorms, mainly after 4pm. Cloudy, then gradually becoming mostly sunny, with a high near 83. Light east wind becoming east southeast 5 to 10 mph in the morning.
Thursday Night
A chance of showers and thunderstorms before 1am, then a slight chance of showers. Increasing clouds, with a low around 64. Southeast wind 5 to 10 mph. Chance of precipitation is 30%.
Friday
A chance of showers before 10am, then a chance of showers and thunderstorms between 10am and 1pm, then showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 81. Southeast wind 5 to 10 mph. Chance of precipitation is 60%.
Friday Night
A slight chance of showers and thunderstorms before 10pm, then a slight chance of showers between 10pm and 1am. Mostly cloudy, with a low around 66. Southeast wind 5 to 10 mph. Chance of precipitation is 20%.
Saturday
A slight chance of showers, then a chance of showers and thunderstorms after 10am. Mostly cloudy, with a high near 82. Southeast wind 5 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 50%.
Saturday Night
A 30 percent chance of showers and thunderstorms. Cloudy, with a low around 67. South southeast wind 10 to 15 mph, with gusts as high as 25 mph.
Sunday
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Cloudy, with a high near 80. South wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 60%.
Sunday Night
A 20 percent chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 68. South southeast wind 10 to 15 mph, with gusts as high as 25 mph.
Monday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 83.
Monday Night
Mostly cloudy, with a low around 69.
Tuesday
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 81.
Tuesday Night
A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 66.
Wednesday
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 78.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles SW San Marcos TX
 29.86°N 97.99°W (Elev. 748 ft)
Last Update:
2:46 pm CDT Apr 8, 2026
Forecast Valid:
4pm CDT Apr 8, 2026-6pm CDT Apr 15, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation